CA1112148A - Mechanical gearing for roller blinds and awnings - Google Patents
Mechanical gearing for roller blinds and awningsInfo
- Publication number
- CA1112148A CA1112148A CA315,030A CA315030A CA1112148A CA 1112148 A CA1112148 A CA 1112148A CA 315030 A CA315030 A CA 315030A CA 1112148 A CA1112148 A CA 1112148A
- Authority
- CA
- Canada
- Prior art keywords
- abutment
- pinion
- pin
- locking disc
- housing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
- E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
- E06B9/00—Screening or protective devices for wall or similar openings, with or without operating or securing mechanisms; Closures of similar construction
- E06B9/56—Operating, guiding or securing devices or arrangements for roll-type closures; Spring drums; Tape drums; Counterweighting arrangements therefor
- E06B9/68—Operating devices or mechanisms, e.g. with electric drive
- E06B9/76—Operating devices or mechanisms, e.g. with electric drive using crank handles
-
- E—FIXED CONSTRUCTIONS
- E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
- E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
- E06B9/00—Screening or protective devices for wall or similar openings, with or without operating or securing mechanisms; Closures of similar construction
- E06B9/56—Operating, guiding or securing devices or arrangements for roll-type closures; Spring drums; Tape drums; Counterweighting arrangements therefor
- E06B9/80—Safety measures against dropping or unauthorised opening; Braking or immobilising devices; Devices for limiting unrolling
- E06B9/82—Safety measures against dropping or unauthorised opening; Braking or immobilising devices; Devices for limiting unrolling automatic
- E06B9/88—Safety measures against dropping or unauthorised opening; Braking or immobilising devices; Devices for limiting unrolling automatic for limiting unrolling
-
- E—FIXED CONSTRUCTIONS
- E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
- E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
- E06B9/00—Screening or protective devices for wall or similar openings, with or without operating or securing mechanisms; Closures of similar construction
- E06B9/56—Operating, guiding or securing devices or arrangements for roll-type closures; Spring drums; Tape drums; Counterweighting arrangements therefor
- E06B9/68—Operating devices or mechanisms, e.g. with electric drive
- E06B2009/6809—Control
- E06B2009/6872—Control using counters to determine shutter position
- E06B2009/6881—Mechanical counters
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T74/00—Machine element or mechanism
- Y10T74/19—Gearing
- Y10T74/19637—Gearing with brake means for gearing
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T74/00—Machine element or mechanism
- Y10T74/19—Gearing
- Y10T74/19642—Directly cooperating gears
- Y10T74/19698—Spiral
- Y10T74/19828—Worm
Landscapes
- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Operating, Guiding And Securing Of Roll- Type Closing Members (AREA)
- Building Awnings And Sunshades (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A transmission or mechanical gearing for roller blinds or gates, window shades and awnings or the like, with a self-locking worm gear drive in a two part housing on one end of a shaft and an abutment for limiting of the number of rotations of the shaft in the unwinding direction. The abutment comprises an abutment pinion having (n) teeth and meshing with the worm wheel, a locking disc having (n-1) teeth and similarly meshing with the worm wheel, the locking disc and the abutment pinion being mounted along a common axis, and an abutting pin. The abutting pin is mounted on the abutment pinion spaced from and with its longitudinal axis parallel to the common axis of the abutment pinion and the locking disc and is mounted to permit movement along its longitudinal axis. A slot is situated in the locking disc in a position to permit the abutting pin to move through it when relative movement of the abutment pinion and the locking disc results in the locking disc and the abutting pin being adjacent to one another. The abutting pin is adapted to move through the slot and engage the abutment to limit movement of the transmission at a predetermined position.
A transmission or mechanical gearing for roller blinds or gates, window shades and awnings or the like, with a self-locking worm gear drive in a two part housing on one end of a shaft and an abutment for limiting of the number of rotations of the shaft in the unwinding direction. The abutment comprises an abutment pinion having (n) teeth and meshing with the worm wheel, a locking disc having (n-1) teeth and similarly meshing with the worm wheel, the locking disc and the abutment pinion being mounted along a common axis, and an abutting pin. The abutting pin is mounted on the abutment pinion spaced from and with its longitudinal axis parallel to the common axis of the abutment pinion and the locking disc and is mounted to permit movement along its longitudinal axis. A slot is situated in the locking disc in a position to permit the abutting pin to move through it when relative movement of the abutment pinion and the locking disc results in the locking disc and the abutting pin being adjacent to one another. The abutting pin is adapted to move through the slot and engage the abutment to limit movement of the transmission at a predetermined position.
Description
The invention relates to a transmission or mechanical gearing for roller blinds or gates, window shades and awnings or the like, with a self-locking worm gear drive in a two part housing on one end of a shaft and an abutment for limiting of the number of rotations of the shaft in the un-winding direction.
Roller blinds actuated by a rope or belt rlm downwardly by their own weight and can only be pulled up again in the opposite rotational sense. ~ -To the contrary, mechanical gearings with a self-locking worm gear drive, which are actuated by means of a crank, can be cranked further in both directions of rotation even with an already closed roller blind. Consequently, particularly with changing operating personnel, the danger exists that a closed roller blind or awning may be cranked up in the wrong direction thereby causing destruction of the roller blinds or the awnings. In order to avoid such operating errors with mechanical gearings having a self-locking worm wheel drive, it is known to provide an abutment for limitation of the number of rotations of the shaft in the unwinding direction. These known abutments or stops can be connected with the worm wheel drive and can be accommodated or placed in the same housing or in a separate housing on the other end of the shaft of the roller blinds or awnings. The accommodation of the abutment in 2a the same housing as the worm wheel drive h0retofore has had the disadvantage that only a very small space was available for the abutment and consequently the construction parts of the abutment were dimensioned poorly or weakly.
Also there was the danger that the abutment only acted as a memory aid and could be easily overwound. The accommodation of the abutment in a separate housing at the other end of the shaft for the roller blinds or the awnings had the disadvantage that two separate housings were required, and it was necessary to adjust or correct the position of the housings in the casings of the roller blinds or the awnings, with respect to one another.
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According to the invention there is provided trans-mission for roller alinds and awnings with a self-locking worm wheel drive having a worm and a worm wheel, comprising a housing :
formed in two parts, a shaft being mounted in said housing~ the worm being mounted on an end of said shaft, an abutment means disposed in said housing for limitation of the number of rota-tions of the sha~t in the unwinding direction, said abutment means comprising; an abutment pinion having a number of teeth, said abutment pinion-meshing with said worm wheel; a locking disc having a different number of teeth then that of said abutment pinion, said locking disc meshing with said worm wheel, said locking dlsc and sald abutment pinion being mounted along a common axis to each other in said housing; an abutment pin axially movably disposed in said abutment pinion; an abutment pin mounted on said abutment pinion, said abutment pin having a longitudinal axis situated parallel to and spaced from said com~on axis of said abutment pinion and sald locking disc, said abutment pin being mounted to permit movement of said pin along lts longitudinal axis, said locking dlsc having a slot therein, said abutment pin being displaceable relat~ve to said slot, said slot being pos.itioned and dimensioned to permlt sald abutment .
pin to move therethrough when said abutment pln is adJacent said slot, said abutment pin being adapted to extend through said slot and operatively engage said abutment in a predetermined pos~ition It is an ob~ect of the present invention therefore to provide mechanical gearing for roller blinds or awnings with a :
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- : ,: : ,: . , ,: .
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,: . : ~ :: : ~ : . -, - : -. . ::: -self-locking worm wheel drive whose abutment for limitation of the number of rotations of a shaft in the unwinding direction is accommodated in the same housing as the worm wheel drive and is so constructed that it cannot be overwound.
It is another object of the present invention to pro-vide a mechanical gearing of the afore-mentioned type wherein the abutment comprises an abutment pinion with the teeth number (e.g., n)~ the abutment pinion meshing with the worm wheel, a locking disc with the tooth number (e.g., n-l), the locking disc likewise meshing with the worm wheel, the locking disc being mounted coaxial to the abutment pinion, and an axially movable abutment pin arranged in the abutment pinion, the abutment pin is pressed by a spring and by means of a slot in the locking disc is able to engage in a double-sided - 2a -.
abutment in the housing.
With a preferred embodiment of the invention, the ends of the slot and the inlet and outlet ends, respectively (which lie at the beginning and end, respectively, of the inclined surfaces) of the two faces of the abutment can be inclined, so that shortly before the roller blind or gate or the awning reaches its end position, the abutment pin can slide silently into a recess in front of the abutment, and upon the cranking up of the roller blind or of the awning, respectively, the abutment pin also can again slide out up to the surface of the locking disc.
Furthermore the axle for the abutment pinion and the locking disc can be formed in one-piece with the abutment and can be secured with the abutment in one-half of the housing.
With a mechanical gear train or transmission formed in accordance with the present invention, the abutment pinion with the abutment pin which is accommodated therein and the locking disc with the slot provided therein shifts as a result of their relatively different numbers of teeth with respect to one another, so that the abutment pin slides through the slot in the locking disc after a certain number of rotations and arrives in front of the abutment in the housing. This construction of the mechanical transmission and of the abutment has the advantage that the abutment in one half of the housing can be constructed so o suficient size and strength that it is not overwound ~ith improper handling. The weakest member in the abutment, namely the abut-ment pin which is arranged axially displaceable in a blind hole of the abutment pinion can be made of steel and can be hardened so that it withstands all shearing stresses which occur with improper handling of the roller blind or o àwnings.
With these and other objects and advantages in view, the present invention will become more clearly understood in association with the . ', ~b .~ . ' , '. ' . ' :,'' '' . ' ' ,' '' ' '' , ' ' ' . " ' , ~' ~' ~ ' '' , - ~ . , ' ' .
4~
detailed description of a preferred embodiment, when considered with the accompanying drawings, of which:
Figure 1 is a plan view of a closed housing formed in two parts for a mechanical gear train in accordance with the present invention;
Figure 2 is a plan view of the same housing after removal of one half of the housing for illustration of the individual parts of the drive;
Figure 3 is a plan view of the same housing, after removal of an abutment pinion and a locking disc, for illustration of the abutment;
Figures 3A and 3B are sections taken along the lines A-A and B-B, respectively, of Figure 3, however with portions of the abutment and axle broken away in Figure 3B in order to show the inclined surface and recess of the housing half;
Figure 4 is a cross-sectional view of the abutment pinion and the locking disc;
Figure 5 is a plan view of the locking disc, Figure 6 is a side elevational view showing a roller blind in the drawn-up position in front of a window.
Referring now to the drawings, in a housing made of synthetic material or plastic, comprising two halves la, lb, there is arranged a mechan-ical gear train or transmission 4. The mechanical gear train 4 comprises a worm 2 and a worm wheel 3. By means of a drive shaft 5 the mechanical gear train acts on a shaft ~not illustrated) of a roller blind or awning. The C latter shaft engages with a bc~.~n~ p_.. in a bore 6 of the worm wheel 3. The worm 2 is non-rotatably arranged on the drive shaft 5 and with the drive shaft 5 is mounted in the housing 1. The worm wheel 3 is provided with ~oaring pi~s 7 formed or attached thereon on both sid~s. Thè wurm wheel 3 likewise is 6~ ~Our~
mounted in the housing 1 wi~h thc bCQF}~g pi-n~ 7. The two halves la, lb of the housing 1 are held together with screws 8.
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The ~orm wheel 3 intermeshes with both an abutment pinion 9 and a locking disc 10, the latter situated coaxially with the pinion 9. Both the pinion and the disc are mounted on an axle 11 which is secured in the housing half lb. With a bearing pin 12 the abutment pinion 9 engages in a bore of the housing half la.
The abutment pinion 9 has the number of teeth n, whereas the locking disc 10 has a number of teeth n-l, so that in the course of one revo-lution~ a relative displacement or shifting occurs by the width of one tooth.
In this manner a slot 13, which is formed in the locking disc 10, with inclin-ed surfaces 14 which are formed on the ends of the slot, is shifted under an abutment pin 16, the abutment pin 16 which is axially displaceable is positioned in a blind hole 15 formed in the abutment pinion 9. The abutment pin 16 is biased outwardly with a compression spring 17 so that the pin 16 is shifted or pushed out from the slot 13 in the locking disc 10.
In the housing half lb, an abutment 18 is secured to or formed integrally with the axle 11. The axle 11 is mounted stationarily and non-rotatably relative to the housing half lb, in a recess 28 in the housing half lb. Recesses 19 are formed in the housing half lb on both semi-circularly shaped lateral sides 18b of the abutment 18. The recesses 19 do not extend 2Q completely through the housing hal lb, but are limited by a lowermost surface 19l of the housing half lb, against whlch surface 19' the end of the abutment pin 16 can engage. The abutment pin 16 can slide into the recess 19 (Figure 3A) over incl.ined or sloping surfaces 20 until the abutment pin 16 abuts or engages the abutment 18 on one or the other lateral side 18b adjacent the recesses 19. By means of the latter, these lateral sides 18b of the abutment 18 act as lateral abutments for the abutment pin 16 in order to prevent rotation of the pinion 9 when the abutment pin 16 is in a recess 19 and abuts the lateral side 18b of the abutment 18. The surface 18c of the diametric , ' . '' " ', :, - . . , ~.
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opposite end 18a of the abutment 18 is substantially flush and coplanar with the inner surface 21 of the housing half lb, whereby the free end of the abutment pin 16 when sliding on the surface 21 during the beginning of a winding up operation (e.g. Figure 3B) can likewise slide over the surface 18c of the abutment end 18a without being blocked.
In assembling the previously described mechanical gearing or transmission the abutment pin 16 abuts or engages the abutment 18 on one slide with a closed roller blind or let down or opened awning. The choice of the abutment side for the abutment pin 16 depends on the assembly of the mechanical gearing on the end of the shaft for the roller blind, or the awning, whereby a movement of the drive shaft 5 in the clockwise sense corres-ponds to the winding-up direction and a movement of the drive shaft 5 in the counterclockwise sense corresponds to the unwinding direction. By the double-sided formation of the abutment 18, it is possible to leave the selection of the drive side open until the final assembly of the roller blind or awning.
If the mechanical gearing has been assembled as previously described in the closed position of the roller blind or in the let-down posi-tion of the awning, during the winding-up of the window shade, rolIer blind, gate or awning, the abutment pin 16 slides out of the recess 19 and slides over the adjacent inclined surface 20, and thereafter also slides out of the slot 13 over the inclined surfaces 14 on the locking disc 10 back into the blind hole 15 in the pinion 9 until the pin 16 is held back in the blind hole 15 by that surface of the locking disc 10 which abuts the pinion 9. Conse-quently during further winding-up the abutment pin 16 can pass over the abut-ment 18 and its lateral sides 18b.
Conversely, during the unwinding of the roller blind or awning, shortly before reaching the end position, the abutment pin 16 again slides in-to the recess 19 through the slot 13 in the locking disc 10, until the pin 16 ~,j"v "
abuts the abutment 18 and one of the lateral abutment sides 18b, thereby blocking or locking the mechanical gearing or transmission in the unwinding direction.
In operation, assuming that the roller blind, gate or awning is in the closed or let down position, the abutment pin 16 extends through the slot 13 in the locking disc 10 and into the recess 19 abutting a side 18b of the abutment 18. If now the mechanical gearing is cranked to begin winding up, the worm 2 turns the worm wheel 3, which in turn rotates the abutment pin-ion 9 and the locking disc 10. This causes the abutment pin 16 to slide on the inclined surface 20, the latter being formed on the housing half lb, whereupon the pin 16 axially slides inwardly somewhat in the hole 15 in the pinion 9 up to the surface of the locking disc 10 (cf. Figure 3B). Upon further rotation of the pinion 9, during the beginning of the winding-up operation but before the abutment pin reaches the other lateral side 18b of the abutment 18 adjacent the other recess 19 ~the latter lateral sides 18b being approximately 350 relative the first lateral side 18b), the slot 13 is angularly displaced completely beyond the pin 16, such that the pin 16 is pushed sufficiently into the blind hole 15, in order to enable the pin 16 to pass over the lateral sides 18b and the abutment 18 without interference.
That is, long before the pin 16 reaches the opposite recess 19 at the other lateral side 18b of the abutment 18, due to rotation of the abutment pinion 9 by means of the worm wheel 3, the different numbers of teeth between the locking disc 10 and the abutment pinion 9 cause a sufficient angular displace-ment of the slo~ 13 relative to the pin 16, such that the abutment pin 16 slides along the inclined end 14 of the slot 13, and the pin 16 is pressed further into the blind hole 15 until its free end is blocked behind the lock-ing disc 10. In this position, the rear surface of the locking disc 10 main-tains the pin inwardly inside the hole 15 so that the pinion 9 and the locking ;~,~i'' ~' ' . -disc lQ can continue to turn without the pin 16 engaging the fixed abutment18 and its abutment surfaces 18b. Consequently during further winding up of the mechanical gearing, the abutment 18 and its surfaces 18b do not block further rotation of the mechanical gearing.
In order that the transmission can be used for various lengths and types of roller blinds and awnings, the drawn-up position is secured against further rotation by a small abutment angle member 24 (Figure 6) mount-ed on the outside on each side of the bottom of the roller blinds or awnings 23, before it can disappear in a slot 26, which slot is left open in the casing of the box 25 of the roller blinds.
While I have disclosed one embodiment of the invention it is to be understood that tllis embodiment is given by example only and not in a limit-ing sense.
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Roller blinds actuated by a rope or belt rlm downwardly by their own weight and can only be pulled up again in the opposite rotational sense. ~ -To the contrary, mechanical gearings with a self-locking worm gear drive, which are actuated by means of a crank, can be cranked further in both directions of rotation even with an already closed roller blind. Consequently, particularly with changing operating personnel, the danger exists that a closed roller blind or awning may be cranked up in the wrong direction thereby causing destruction of the roller blinds or the awnings. In order to avoid such operating errors with mechanical gearings having a self-locking worm wheel drive, it is known to provide an abutment for limitation of the number of rotations of the shaft in the unwinding direction. These known abutments or stops can be connected with the worm wheel drive and can be accommodated or placed in the same housing or in a separate housing on the other end of the shaft of the roller blinds or awnings. The accommodation of the abutment in 2a the same housing as the worm wheel drive h0retofore has had the disadvantage that only a very small space was available for the abutment and consequently the construction parts of the abutment were dimensioned poorly or weakly.
Also there was the danger that the abutment only acted as a memory aid and could be easily overwound. The accommodation of the abutment in a separate housing at the other end of the shaft for the roller blinds or the awnings had the disadvantage that two separate housings were required, and it was necessary to adjust or correct the position of the housings in the casings of the roller blinds or the awnings, with respect to one another.
: '' ' ' '' . . ", '. :
. .
~: .
.
. : . : ~: - : - , -.. . . . :
According to the invention there is provided trans-mission for roller alinds and awnings with a self-locking worm wheel drive having a worm and a worm wheel, comprising a housing :
formed in two parts, a shaft being mounted in said housing~ the worm being mounted on an end of said shaft, an abutment means disposed in said housing for limitation of the number of rota-tions of the sha~t in the unwinding direction, said abutment means comprising; an abutment pinion having a number of teeth, said abutment pinion-meshing with said worm wheel; a locking disc having a different number of teeth then that of said abutment pinion, said locking disc meshing with said worm wheel, said locking dlsc and sald abutment pinion being mounted along a common axis to each other in said housing; an abutment pin axially movably disposed in said abutment pinion; an abutment pin mounted on said abutment pinion, said abutment pin having a longitudinal axis situated parallel to and spaced from said com~on axis of said abutment pinion and sald locking disc, said abutment pin being mounted to permit movement of said pin along lts longitudinal axis, said locking dlsc having a slot therein, said abutment pin being displaceable relat~ve to said slot, said slot being pos.itioned and dimensioned to permlt sald abutment .
pin to move therethrough when said abutment pln is adJacent said slot, said abutment pin being adapted to extend through said slot and operatively engage said abutment in a predetermined pos~ition It is an ob~ect of the present invention therefore to provide mechanical gearing for roller blinds or awnings with a :
, - . , . -: , , .
- : ,: : ,: . , ,: .
.
,: . : ~ :: : ~ : . -, - : -. . ::: -self-locking worm wheel drive whose abutment for limitation of the number of rotations of a shaft in the unwinding direction is accommodated in the same housing as the worm wheel drive and is so constructed that it cannot be overwound.
It is another object of the present invention to pro-vide a mechanical gearing of the afore-mentioned type wherein the abutment comprises an abutment pinion with the teeth number (e.g., n)~ the abutment pinion meshing with the worm wheel, a locking disc with the tooth number (e.g., n-l), the locking disc likewise meshing with the worm wheel, the locking disc being mounted coaxial to the abutment pinion, and an axially movable abutment pin arranged in the abutment pinion, the abutment pin is pressed by a spring and by means of a slot in the locking disc is able to engage in a double-sided - 2a -.
abutment in the housing.
With a preferred embodiment of the invention, the ends of the slot and the inlet and outlet ends, respectively (which lie at the beginning and end, respectively, of the inclined surfaces) of the two faces of the abutment can be inclined, so that shortly before the roller blind or gate or the awning reaches its end position, the abutment pin can slide silently into a recess in front of the abutment, and upon the cranking up of the roller blind or of the awning, respectively, the abutment pin also can again slide out up to the surface of the locking disc.
Furthermore the axle for the abutment pinion and the locking disc can be formed in one-piece with the abutment and can be secured with the abutment in one-half of the housing.
With a mechanical gear train or transmission formed in accordance with the present invention, the abutment pinion with the abutment pin which is accommodated therein and the locking disc with the slot provided therein shifts as a result of their relatively different numbers of teeth with respect to one another, so that the abutment pin slides through the slot in the locking disc after a certain number of rotations and arrives in front of the abutment in the housing. This construction of the mechanical transmission and of the abutment has the advantage that the abutment in one half of the housing can be constructed so o suficient size and strength that it is not overwound ~ith improper handling. The weakest member in the abutment, namely the abut-ment pin which is arranged axially displaceable in a blind hole of the abutment pinion can be made of steel and can be hardened so that it withstands all shearing stresses which occur with improper handling of the roller blind or o àwnings.
With these and other objects and advantages in view, the present invention will become more clearly understood in association with the . ', ~b .~ . ' , '. ' . ' :,'' '' . ' ' ,' '' ' '' , ' ' ' . " ' , ~' ~' ~ ' '' , - ~ . , ' ' .
4~
detailed description of a preferred embodiment, when considered with the accompanying drawings, of which:
Figure 1 is a plan view of a closed housing formed in two parts for a mechanical gear train in accordance with the present invention;
Figure 2 is a plan view of the same housing after removal of one half of the housing for illustration of the individual parts of the drive;
Figure 3 is a plan view of the same housing, after removal of an abutment pinion and a locking disc, for illustration of the abutment;
Figures 3A and 3B are sections taken along the lines A-A and B-B, respectively, of Figure 3, however with portions of the abutment and axle broken away in Figure 3B in order to show the inclined surface and recess of the housing half;
Figure 4 is a cross-sectional view of the abutment pinion and the locking disc;
Figure 5 is a plan view of the locking disc, Figure 6 is a side elevational view showing a roller blind in the drawn-up position in front of a window.
Referring now to the drawings, in a housing made of synthetic material or plastic, comprising two halves la, lb, there is arranged a mechan-ical gear train or transmission 4. The mechanical gear train 4 comprises a worm 2 and a worm wheel 3. By means of a drive shaft 5 the mechanical gear train acts on a shaft ~not illustrated) of a roller blind or awning. The C latter shaft engages with a bc~.~n~ p_.. in a bore 6 of the worm wheel 3. The worm 2 is non-rotatably arranged on the drive shaft 5 and with the drive shaft 5 is mounted in the housing 1. The worm wheel 3 is provided with ~oaring pi~s 7 formed or attached thereon on both sid~s. Thè wurm wheel 3 likewise is 6~ ~Our~
mounted in the housing 1 wi~h thc bCQF}~g pi-n~ 7. The two halves la, lb of the housing 1 are held together with screws 8.
.. .
The ~orm wheel 3 intermeshes with both an abutment pinion 9 and a locking disc 10, the latter situated coaxially with the pinion 9. Both the pinion and the disc are mounted on an axle 11 which is secured in the housing half lb. With a bearing pin 12 the abutment pinion 9 engages in a bore of the housing half la.
The abutment pinion 9 has the number of teeth n, whereas the locking disc 10 has a number of teeth n-l, so that in the course of one revo-lution~ a relative displacement or shifting occurs by the width of one tooth.
In this manner a slot 13, which is formed in the locking disc 10, with inclin-ed surfaces 14 which are formed on the ends of the slot, is shifted under an abutment pin 16, the abutment pin 16 which is axially displaceable is positioned in a blind hole 15 formed in the abutment pinion 9. The abutment pin 16 is biased outwardly with a compression spring 17 so that the pin 16 is shifted or pushed out from the slot 13 in the locking disc 10.
In the housing half lb, an abutment 18 is secured to or formed integrally with the axle 11. The axle 11 is mounted stationarily and non-rotatably relative to the housing half lb, in a recess 28 in the housing half lb. Recesses 19 are formed in the housing half lb on both semi-circularly shaped lateral sides 18b of the abutment 18. The recesses 19 do not extend 2Q completely through the housing hal lb, but are limited by a lowermost surface 19l of the housing half lb, against whlch surface 19' the end of the abutment pin 16 can engage. The abutment pin 16 can slide into the recess 19 (Figure 3A) over incl.ined or sloping surfaces 20 until the abutment pin 16 abuts or engages the abutment 18 on one or the other lateral side 18b adjacent the recesses 19. By means of the latter, these lateral sides 18b of the abutment 18 act as lateral abutments for the abutment pin 16 in order to prevent rotation of the pinion 9 when the abutment pin 16 is in a recess 19 and abuts the lateral side 18b of the abutment 18. The surface 18c of the diametric , ' . '' " ', :, - . . , ~.
- . . : - .: . ...
- - . , ~ - .. . .
~ . ' ~: .: - ' :
opposite end 18a of the abutment 18 is substantially flush and coplanar with the inner surface 21 of the housing half lb, whereby the free end of the abutment pin 16 when sliding on the surface 21 during the beginning of a winding up operation (e.g. Figure 3B) can likewise slide over the surface 18c of the abutment end 18a without being blocked.
In assembling the previously described mechanical gearing or transmission the abutment pin 16 abuts or engages the abutment 18 on one slide with a closed roller blind or let down or opened awning. The choice of the abutment side for the abutment pin 16 depends on the assembly of the mechanical gearing on the end of the shaft for the roller blind, or the awning, whereby a movement of the drive shaft 5 in the clockwise sense corres-ponds to the winding-up direction and a movement of the drive shaft 5 in the counterclockwise sense corresponds to the unwinding direction. By the double-sided formation of the abutment 18, it is possible to leave the selection of the drive side open until the final assembly of the roller blind or awning.
If the mechanical gearing has been assembled as previously described in the closed position of the roller blind or in the let-down posi-tion of the awning, during the winding-up of the window shade, rolIer blind, gate or awning, the abutment pin 16 slides out of the recess 19 and slides over the adjacent inclined surface 20, and thereafter also slides out of the slot 13 over the inclined surfaces 14 on the locking disc 10 back into the blind hole 15 in the pinion 9 until the pin 16 is held back in the blind hole 15 by that surface of the locking disc 10 which abuts the pinion 9. Conse-quently during further winding-up the abutment pin 16 can pass over the abut-ment 18 and its lateral sides 18b.
Conversely, during the unwinding of the roller blind or awning, shortly before reaching the end position, the abutment pin 16 again slides in-to the recess 19 through the slot 13 in the locking disc 10, until the pin 16 ~,j"v "
abuts the abutment 18 and one of the lateral abutment sides 18b, thereby blocking or locking the mechanical gearing or transmission in the unwinding direction.
In operation, assuming that the roller blind, gate or awning is in the closed or let down position, the abutment pin 16 extends through the slot 13 in the locking disc 10 and into the recess 19 abutting a side 18b of the abutment 18. If now the mechanical gearing is cranked to begin winding up, the worm 2 turns the worm wheel 3, which in turn rotates the abutment pin-ion 9 and the locking disc 10. This causes the abutment pin 16 to slide on the inclined surface 20, the latter being formed on the housing half lb, whereupon the pin 16 axially slides inwardly somewhat in the hole 15 in the pinion 9 up to the surface of the locking disc 10 (cf. Figure 3B). Upon further rotation of the pinion 9, during the beginning of the winding-up operation but before the abutment pin reaches the other lateral side 18b of the abutment 18 adjacent the other recess 19 ~the latter lateral sides 18b being approximately 350 relative the first lateral side 18b), the slot 13 is angularly displaced completely beyond the pin 16, such that the pin 16 is pushed sufficiently into the blind hole 15, in order to enable the pin 16 to pass over the lateral sides 18b and the abutment 18 without interference.
That is, long before the pin 16 reaches the opposite recess 19 at the other lateral side 18b of the abutment 18, due to rotation of the abutment pinion 9 by means of the worm wheel 3, the different numbers of teeth between the locking disc 10 and the abutment pinion 9 cause a sufficient angular displace-ment of the slo~ 13 relative to the pin 16, such that the abutment pin 16 slides along the inclined end 14 of the slot 13, and the pin 16 is pressed further into the blind hole 15 until its free end is blocked behind the lock-ing disc 10. In this position, the rear surface of the locking disc 10 main-tains the pin inwardly inside the hole 15 so that the pinion 9 and the locking ;~,~i'' ~' ' . -disc lQ can continue to turn without the pin 16 engaging the fixed abutment18 and its abutment surfaces 18b. Consequently during further winding up of the mechanical gearing, the abutment 18 and its surfaces 18b do not block further rotation of the mechanical gearing.
In order that the transmission can be used for various lengths and types of roller blinds and awnings, the drawn-up position is secured against further rotation by a small abutment angle member 24 (Figure 6) mount-ed on the outside on each side of the bottom of the roller blinds or awnings 23, before it can disappear in a slot 26, which slot is left open in the casing of the box 25 of the roller blinds.
While I have disclosed one embodiment of the invention it is to be understood that tllis embodiment is given by example only and not in a limit-ing sense.
C''~
' . .
Claims (6)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. Transmission for roller blinds and awnings with a self-locking worm wheel drive having a worm and a worm wheel, comprising a housing formed in two parts, a shaft being mounted in said housing, the worm being mounted on an end of said shaft, an abutment means disposed in said housing for limitation of the number of rotations of the shaft in the unwinding direction, said abutment means comprising: an abutment pinion having a number of teeth, said abutment pinion meshing with said worm wheel; a locking disc having a different number of teeth than that of said abutment pinion, said locking disc meshing with said worm wheel, said locking disc and said abutment pinion being mounted along a common axis to each other in said housing;
an abutment pin axially movably disposed in said abutment pin-ion; an abutment pin mounted on said abutment pinion, said abutment pin having a longitudinal axis situated parallel to and spaced from said common axis of said abutment pinion and said locking disc, said abutment pin being mounted to permit movement of said pin along its longitudinal axis, said locking disc having a slot therein, said abutment pin being displaceable relative to said slot, said slot being positioned and dimensioned to permit said abutment pin to move therethrough when said abutment pin is adjacent said slot, said abutment pin being adapted to extend through said slot and operatively engage said abutment in a predetermined position.
an abutment pin axially movably disposed in said abutment pin-ion; an abutment pin mounted on said abutment pinion, said abutment pin having a longitudinal axis situated parallel to and spaced from said common axis of said abutment pinion and said locking disc, said abutment pin being mounted to permit movement of said pin along its longitudinal axis, said locking disc having a slot therein, said abutment pin being displaceable relative to said slot, said slot being positioned and dimensioned to permit said abutment pin to move therethrough when said abutment pin is adjacent said slot, said abutment pin being adapted to extend through said slot and operatively engage said abutment in a predetermined position.
2. The transmission according to claim 1, wherein said housing adjacent said abutment defines inlet and outlet ends, the ends of said slot as well as said inlet and outlet ends are formed with inclined surfaces, said abutment pin slides against said ends, respectively.
3. The transmission according to claim 1, further com-prising an axle means for mounting said abutment pinion and said locking disc thereon, said axle means is formed in one-piece with said abutment and is operatively fastened with said abutment in one of said two parts of said housing.
4. The transmission according to claim 1, wherein said abutment is adapted to be operatively abutted on both sides thereof by said pin.
5, The transmission according to claim 1, wherein said locking disc has one less tooth than that of said abutment pinion.
6. The transmission according to claim 3, wherein said locking disc and said abutment pinion are disposed against one another, said abutment is disposed between said housing and against said locking disc, said abutment comprises a member extending from said common axis and perpendicular thereto, at least a distance equal to the distance of said abutment pin axis from said common axis.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP2823134.7 | 1978-05-26 | ||
| DE2823134A DE2823134C3 (en) | 1978-05-26 | 1978-05-26 | Gear for roller shutters and awnings |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1112148A true CA1112148A (en) | 1981-11-10 |
Family
ID=6040302
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA315,030A Expired CA1112148A (en) | 1978-05-26 | 1978-10-31 | Mechanical gearing for roller blinds and awnings |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US4238969A (en) |
| CA (1) | CA1112148A (en) |
| DE (1) | DE2823134C3 (en) |
Families Citing this family (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4852923A (en) * | 1987-02-27 | 1989-08-01 | Rexnord Holdings Inc. | Vertical access adjustable latching mechanism externally accessible adjustable keeper mechanism |
| FR2702514B1 (en) * | 1993-03-11 | 1995-05-12 | Simu | Winch with stroke limiter for the operation of blinds, roller shutters and other rolling closing devices. |
| DE19536134A1 (en) * | 1995-09-28 | 1997-04-03 | Geiger Gerhard Gmbh & Co | awning |
| DE19536055A1 (en) * | 1995-09-28 | 1997-04-03 | Geiger Gerhard Gmbh & Co | Limitation of failure for awnings |
| DE19536135A1 (en) * | 1995-09-28 | 1997-04-03 | Geiger Gerhard Gmbh & Co | Gear for awning |
| FR2744167B1 (en) * | 1996-01-25 | 1998-06-12 | Zurfluh Feller | OFFSET OPERATING DEVICE FOR ROLLING SHUTTER |
| ES2138482B1 (en) * | 1996-03-15 | 2000-08-16 | Fuertes Justo Miedes | OPERATION SYSTEM FOR ROLLING BLADES. |
| US6497267B1 (en) * | 2000-04-07 | 2002-12-24 | Lutron Electronics Co., Inc. | Motorized window shade with ultraquiet motor drive and ESD protection |
| DE10257057A1 (en) * | 2002-12-06 | 2004-07-22 | Gross, Beatrix | Drive gearing for roller blinds, has screw wheel gearing coupled to worm gearing |
| ES2258357B1 (en) * | 2003-04-16 | 2007-11-01 | Miguel Emper Sanchez | SELF-LOCKING SYSTEM FOR BLINDS AND CLOSURES. |
| ES2263337B1 (en) * | 2004-06-30 | 2007-11-01 | Miguel Emper Sanchez | SELF-LOCKING DEVICE FOR BLINDS AND CLOSURES. |
| US20080190570A1 (en) * | 2005-03-21 | 2008-08-14 | Francisco Guillen Chico | End Stop Device for Blind-Rolling Shafts |
| US7659019B2 (en) * | 2005-09-16 | 2010-02-09 | Idatech, Llc | Thermally primed hydrogen-producing fuel cell system |
| US7730689B2 (en) * | 2007-01-30 | 2010-06-08 | Carmen L. Figueroa-Morales | Window arrangement to aid in the reduction of unwanted air movement in or out of windows |
| EP2063200A1 (en) * | 2007-11-22 | 2009-05-27 | Siemens Geared Motors GmbH | Dual shaft drive assembly |
| WO2009089597A1 (en) * | 2008-01-19 | 2009-07-23 | Ema International Pty. Ltd. | External tandem screen assembly |
| US7995273B1 (en) | 2010-08-09 | 2011-08-09 | Stewart Flimscreen Corporation | Dual projection screen structure |
| US8169698B1 (en) | 2011-08-08 | 2012-05-01 | Stewart Filmscreen Corporation | Dual movable projection screen structure |
| CN107448551A (en) * | 2016-05-31 | 2017-12-08 | 中核新能核工业工程有限责任公司 | A kind of worm gear arrangement for also serving as position-limit mechanism |
| US11713620B2 (en) * | 2017-10-24 | 2023-08-01 | Maxxmar Inc. | Blind control having a narrow profile drive |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE795487A (en) * | 1972-05-08 | 1973-05-29 | Gfa Antriebstechnik G M B H | LOCKING DEVICE FOR A WINDING MECHANISM |
| SE405758B (en) * | 1975-11-13 | 1978-12-27 | Aberg Martin B | SAFETY DEVICE FOR GEAR GEAR |
-
1978
- 1978-05-26 DE DE2823134A patent/DE2823134C3/en not_active Expired
- 1978-10-31 CA CA315,030A patent/CA1112148A/en not_active Expired
- 1978-11-20 US US05/962,085 patent/US4238969A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| DE2823134A1 (en) | 1979-11-29 |
| US4238969A (en) | 1980-12-16 |
| DE2823134C3 (en) | 1980-11-13 |
| DE2823134B2 (en) | 1980-03-27 |
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Legal Events
| Date | Code | Title | Description |
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| MKEX | Expiry |